Escape filter device having protective hood

Abstract

An escape filter device for engagement over the head of a wearer, comprises a protective hood made of a transparent foil, such as, a plastic material. The hood has an opening in the front which aligns with the mouth of the wearer into which a mouthpiece of a filter is attached. The filter has means for purifying the incoming air which is inhaled into the mouth and exhaled out of the mouth directly through passages defined in the filter. The hood includes a nose piece of resilient material which projects inside of the hood against the face of the wearer beneath the nose and over the upper lip. This nose piece may be compressed to engage it tightly against the nose to prevent breathing of any air which enters into the hood by tightening a strap which engages around the jaw and neck of the wearer and may be fastened at the rear of the hood. An additional chin strap or strap fitting below the chin against the neck may be provided.

What is claimed is: 
     
       1. An escape filter device, for engagement over the head of a wearer, comprising a protective hood made of a transparent foil material engageable on the wearer's head and having an opening in an area adapted to overlie the wearer's mouth, an external strap fixed to said hood and extending around the front of the hood over the mouth area and below the area of the wearer's nose, a respiratory filter arranged outside the hood and having an air passage connecting piece extending through the opening of said protective hood to the inside and terminating in the mouthpiece adapted to engage in the mouth of the wearer, a nose pad carried by said hood on its interior directly adjacent the opening in a position disposed below the nose of the wearer and underlying said strap, said strap having ends external of said hood which may be placed around said hood and tied in the back of the wearer's neck, whereby, to compress said nose pad into engagement with the wearer's nose. 
     
     
       2. An escape filter device, according to claim 1, wherein said protective hood is made of a heat-resistant, non-flammable material. 
     
     
       3. An escape filter device, according to claim 1, wherein said filter includes an exhaling valve located outside of said protective hood. 
     
     
       4. An escape filter device, according to claim 1, wherein said air filter comprises a carbon monoxide filter. 
     
     
       5. An escape filter device, according to claim 1, including a plug secured in the mouthpiece of said filter and means for automatically removing said plug prior to its insertion on the head of a wearer. 
     
     
       6. An escape filter device, according to claim 5, wherein said hood constitutes a casing for containing said filter when not in use, said hood having a backwall wall connected to said plug, said plug being retained by said back wall when said filter is removed therefrom.